Where/what is the best build video? My first Skywalker and no instructions.

i have ordered 4 skywalker (3 for friends, 1 for me) from another seller, no one came in perfect condition, always have dent somewhere. and the worst my skywalker came with bent vertical stabilizer/rudder. there's no protection on packaging (bublewrap cant protect the plane when shipping).

I taped my Condor together today, used a battery for weight and threw it around. It seemed to take a nice long level glide path with the CG at 125 mm from LE against fuse. Don't know how it compares with the other wings. Is this a good method to determine CG?